It's heartwarming that these two put themselves at risk to rescue enemy sailors, but allied POW had a pretty appalling death rate...
The sailors they rescued weren't actually kept as POWs for very long, however. Unlike the Bataan Death March or other horror stories, the sailors Ikazuchi and Inazuma picked up were handed over to a Dutch hospital ship, so nearly all of them almost certainly survived.
The treatment of POWs tended to be relatively closely tied to both the personal tendencies of the captains or admirals in charge, and the way that the war was going, with losers being more vindictive. All Allied POWs the Japanese had with them after Midway were essentially executed on the spot. (Tied to a weighted barrel and thrown overboard.)
And that's hardly limited to the Japanese, as well. There are numerous reports of American ships or aircraft machine gunning survivors of sinking ships. After Guadalcanal, and Yuudachi's running a "white flag" but still firing and sinking a US ship, especially, the Admiral in charge issued a "No Quarter" order (basically, a "don't take prisoners" order) until Halsey was put back in charge, and countermanded it.
As a last bitter irony, Ikazuchi was sunk by a submarine (USS Harder) she was pursuing while protecting a convoy, and nobody came back to save her. Her entire crew died.
... the sailors Ikazuchi and Inazuma picked up were handed over to a Dutch hospital ship, so nearly all of them almost certainly survived.
Dutch Hospital Ship Op Ten Noort was already captured by the Japanese during that time (she was capture by Amatsukaze and Harusame by the way). Op Ten Noort served as a medical facility for POWs within several prison camps in Southeast Asia. On June 5, 1942, Op Ten Noort was renamed Tenno Maru and on October 16, 1942, the Dutch flag was hauled down and replaced by a Japanese Flag, her Dutch medical staff of 44 were interned at the Aiko Medical Facility in Miyoshi, Hirshima Prefecture; the 35 Indonesian crewmen went to the Kakugorocho Church in Sendai, Miyagi Prefecture. Reportedly, all but 1 Indonesian survived the war. Tenno Maru continued providing medical service for several soldiers, POWs and civilians throughout the war. Then on October 25, 1944, Tenno Maru was renamed Hikawa Maru to further disguise her from the allies. On August 17, 1945, the Japanese decided to scuttle Hikawa Maru so that the Allies won't discover that she was the captured Dutch Hospital Ship.
On 1952, a wreck from an unknown ship was snagged on the fishing nets at Wakasa Bay, Maizuru. The head of the department that governs the port area of Chinju Prefecture arranges for salvage investigations. That autumn, Mr. Shinta Koyua, a professional diver from Kyoto, dives and photographs the wreck allowing the ship to be identified. On 1953, for violating the Hague Conventions about hospital ships, the Dutch government lodges for 700 million yen from the Japanese as compensation for the loss of the ship. The sum was revised downward to 200 million yen.
